Cursor lock and sql command

[Fran=?ISO-8859-1?B?5w==?=ois Van Lerberghe]

Hello,

I do not see it in the documentation.
Is a SQL command ("UPDATE" for example) doing some lock on the updated
record ?
Is it good if I create a Vcursor with EVLockType.kReadOnly (or kReadWrite)
and next I do a sqlExecute("UPDATE...") on one record included in the first
locked cursor or is a valentina exception raised ?

François Van Lerberghe
Rue Thier Monty, 15 A
4570 Marchin
Belgique